Dynasty carriers are probably the easiest of the current models to paint. Disassemble them, clean them, and it's pretty much point-n-shoot with flat spray paint. (Like anything you spray paint, use multiple thin coats for best results.) Paint only the white sheet aluminum parts. Don't paint the hardware or j-hooks.
When I marched Dynasty drums in drum corps, we painted the bottom part of the carriers flat black to match our uniforms. Otherwise, the white carriers sticking out from under our jackets really stood out against the black drums and black/blue uniforms. To lessen the amount of scratched and flaking paint to deal with, we left the top half of the carriers white. Nobody would see it when we're in uniform anyway.
The paint job will scratch pretty easily, but that's going to be the case for just about any finish option you apply over the stock powder coat.